Improvement in paper-bag machines



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,y UNITED STATES PATENT OFFICE.

.LUTHER C. CROWELL, OF BOSTON, ASSIGNOR OF ONE-FOURTH HIS RIGHT TO LUTHER CRANE, OF CAMBRIDGE, AND ONE-FOURTH HIS RIGHT TO yGALEN COFFIN, OF BOSTON, MASSACHUSETTS..

IMPROVEMENT IN PAPER-BAG MACHiNES.

Specification forming part of Letters Patent N o. 123,812, dated February 20,1872.

To all whom 'it may concer-n:

Be it known that I, LUTHER C. CRowELL, of Boston, in the county of Suffolk and State of Massachusetts, haveinvented certain Improvements in the Manufacture of Paper Bags; and I do hereby declare that the following, taken in connection with the drawing which accompanies and forms part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

My invention relates to the manufacture of paper bags from flat continuous tubes of paper, which tubes are made from continuous bands of paper by folding, lapping, and cementing `the edges together, the tubes thus formed being wound upon suitable rolls or mandrels when the cemented edge or joint is sufficiently dry. These tube-wound rolls are used in this invention.

In the machine herein described, a roll of iiat paper tube is placed in one end of a suitable frame. An isolated expander is inserted into the tube, being held in position by means of outside rolls. The end of the paper tube is laid over a supporting-roll to the feeding-rolls. Wires or suitable guides are now brought to bear upon the sides of the paper tube, pressing them into slots or-channels on each side of the expander, so that as the paper tube is drawn along by and over the isolated expander and the creasing-bars or guides a continuous inward fold is made upon each side of the paper tube. In this folded condition it is led through the machine, a knife being made to descend upon the paper tube between the feed and supporting rolls and near the end of the isolated expander, perforating and cutting the upper plane of said tube laterally, leaving all that portion of the tube below1 the upper surface of the expander intact. By this portion the paper tube is drawn continuously over the expander until in the proper position, when the operation of another knife severs the tube, and the blank thus made is cemented, bottom folded, and delivered from the machine, forming a bag or case, which, when lled, will assume a quadrangular shape.

I Will now proceed to describe my invention with reference to the drawing, which represents a machine embodying the same.

Figure l shows the machine in plan; Fig.- 2, a side elevation of the same. Fig. 3 is a perspective view of the expander or separator. Fig. 4L is a longitudinal vertical section of the machine. Fig. 5 shows the two cutting-knives m u..

A represents a perspective view of the cut blank, a3 representing the projecting lip, b3 b3 the inward longitudinal folds. B represents a perspective view of the bag as it leaves the machine, a3 representing the bottom lap closing the end of the cut blank. a denotes the frame 5 b c, the feed-rolls, which are geared together by toothed wheels d e. To the shaft o f the upper feed-roll b are attached the path or grooved cam-wheels f f and the pulley g, which drives the paste-roll, and also a crank or pulley, h, by which the machine is operated from steam vor other suitable power. t' t' are levers, which are pivoted at j, and actuated by pins 7c attached to said levers and projecting into grooves Z of the cam-wheels f. To said levers two knives or serrated bars, m n, are attached, one at each end, and said levers are so shaped that the cutting-bar m is held above a horizontal line and the cutting-bar n below a horizontal line. o is a stand supporting a guide-plate, p. q is a guide-plate, located at a sufficient height from guide-plate p to allow the paper tube B to pass freely between' them. 1" T are levers pivoted at s. At one end of said levers are attached pins t t, projecting into grooves t' in cam-wheel j'. At the opposite ends of said levers are located the folding, pressing, and

delivery rolls o o, which are geared together by toothed wheels w w, and are driven by being kept in gear with toothed wheel said wheel x engaging with toothed wheel d on the driving-shaft b. y is a table, supported by a stand, z, the end a2 being bent at an angle, the apex being immediately below and between the two rolls o v.- b2 b2 are rolls, which, being driven by tapes c2 c2 passing over rolls fv o, assist in delivering the bags from the machine. d2 is a box containing the cement; e2, a cementroll, driven by belt fz passing over pulley g2. h2 is a doctor, regulating the quantity of cement taken up on the surface of said roll. i2 is a bar, located above said cement-roll, against which the paste is lodged, forming a narrow wall of cement, which is readily taken up by the end of the paper tube during the operation of the machine. A is the separator or expander. jZ jz are surface-rolls pivoted at 7a2 k2. L2 l2 are channels or spaces on each side of said expander. m2 m2 are rolls, secured in such position as will prevent the expander A from passing between them.l a2 a2 are adjustable guides or creasers secured at z2, allowing the ends m2 to project into the channels ZZ Z2. o2 is a supporting-roll. p2 is a leading-roll. q2 is the roll of paper tube.

In operating this machine, the end of the paper tube is led over the roll p2 over and inclosing the expander A (which is now isolated) between rolls m2 m2 by the guides or creasingbars u2 n2, such operation forming longitudinal folds invardly'on each side of the paper tube. The rolls m2 m2 are now secured sufficiently near to each other to allow the paper to pass between them an d the rolls j jz of the expander A. Said rolls jz 72, being in the rear of the rolls m2 m2, prevent the isolated expander from being drawn into the machine by the friction of the paper tube in passing. The longitudinallyfolded paper tube is led to the feed-rolls b o. The machine is now ready for operating. rlhe circumference of the feed-rolls being equal to the length of the bag to be made, at each revolution of the same the levers i t' throw the rear knife m down upon the paper tube, cutting such portion of the same as is above the end s2 of separator A. The tube, as thus partially severed by the complete revolution of the feedrolls, is carried on between the guide-plates p q, when the levers M are again operated, throwing the knife n up, completely severing the tube, and the knife m down, making the partial cut, as above described, the knives being located so that the cut made by mis in advance of the cut made by u. The end of the paper tube, as thus cut, is carried on to table y and projected over the angle a2, when the rolls o /v are thrown down, striking the paper tube and bending the end down against the cementcharged bar 2; vat the same time, bytheir con.- tinuous motion, biting the paper by the-fold made at angle c2, lapping the cemented end over upon the body of the bag, and, passing between tapes c2 02, the bag is delivered from themachine. By the operation of the grooved cams a upon the pins t t, the rolls o o are raised at the proper time to allow the end of the succeedin g blank to pass freely between them and the table y. The grooved cams Z u are so disposed that at each revolution of the feed-rolls b c the knives m n and rolls o c are made to operate upon the paper successively, producing the result as herein described.

By this machine, or an equivalent method of operation, bags or cases that will assume a quadrangular shape when filled are rapidly and reliably made.

I am aware that mechanism could be arranged to paste 4the edge of a strip of paper,

making the same into a tube, and simultaneously making the longitudinal folds, but should prefer the method here-in described, as the dryness of the stock in the long tube of paper enables bags to be formed rapidly without the liability of opening the joint, and also guarantees every bag delivered from the machine to be free from paste or cement inside ofthe bag, (which is oftenV the case with bags made on other machines, cementing the Walls of the bag together, rendering it useless.) A machine as herein described could be made wide enough to take two or more tubes of paper and simultaneously act upon them all to convert them into bags, and yet be 4compact and reliable. By removing the creasers 0r edges n2 n2, and enlarging the end s2 of separator A to correspond with the width of the paper tube, common bags could be made.

l claiml. The folding-bars u2, in combination with the expander A, when used for the purpose herein shown and described.

2. The combination of the knife n with the knife m, the knife u operating upon the paper between the feed-rolls b 'c and the folding-rolls o 0, and the knife m operating upon the opposite side of the feed-rolls b c, in the manner and for the purpose herein shown and described.

3. The rolls Iv u, cement-roll e2, and guiding plate or table y, having the folding-plate c2, the rolls bending the projecting end of the bag down and pressing it against the cement-roll of the cement-bar, and then folding said cementapplied end back upon the body of the tube and feeding the bag thus formed to the take- Off tapes.

4. The combination of cam-wheels f f, knifeleversz' z', and folding-roll levers r 1" with feedrolls b c and paste-roll e?, for the purpose herein described.

LUTHER G. CROWELL.

Witnesses:

E. R. RYDER, v BURTON GoGGswnLL. 

